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src/Diagram.hs
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@ -34,6 +34,11 @@ data Diagram vtx = Diagram
} }
deriving (Show, Read) deriving (Show, Read)
data Direction
= Up
| Down
deriving (Eq, Ord, Read, Show)
data InsertError vtx data InsertError vtx
= InsertError_DuplicateVertex = InsertError_DuplicateVertex
| InsertError_UnknownDownVertex vtx | InsertError_UnknownDownVertex vtx